diff options
Diffstat (limited to 'src/main.c')
| -rw-r--r-- | src/main.c | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c new file mode 100644 index 0000000..ad92978 --- /dev/null +++ b/src/main.c @@ -0,0 +1,312 @@ +#include <bcd.h> +#include <gb/gb.h> +#include <rand.h> +#include <stdbool.h> + +#include "backgrounds/background.h" +#include "backgrounds/game_over.h" +#include "backgrounds/game_over_map.h" +#include "backgrounds/map.h" +#include "backgrounds/numerals.h" +#include "defines.h" +#include "metasprite.h" +#include "pipe.h" +#include "sprites/bird.h" +#include "sprites/button.h" +#include "sprites/pipe.h" + +UINT8 g_background_position = 0; +UINT8 g_foreground_position = 0; +BCD g_player_score = 0; +BCD g_player_high_score = 0; +UINT8 g_foreground_scroll_speed = FOREGROUND_SCROLL_SPEED; +Metasprite g_bird = { + .x = 30, + .y = 70, + .width = BIRD_WIDTH, + .height = BIRD_HEIGHT, + .velocity_x = 0, + .velocity_y = 0, + .sprite_ids = {0, 1, 2, 3}, + .tile_ids = {0, 1, 2, 3}, +}; + +Metasprite g_button = {.x = 80, + .y = 68, + .width = 16, + .height = 16, + .velocity_x = 0, + .velocity_y = 0, + .sprite_ids = {4, 5, 6, 7}, + .tile_ids = {BUTTON_TILE_START, BUTTON_TILE_START + 1, + BUTTON_TILE_START + 2, + BUTTON_TILE_START + 3}}; + +void on_hbl_interrupt() { + switch (LYC_REG) { + case 0x00: + move_bkg(g_background_position, 0); + LYC_REG = 0x78; + break; + case 0x78: + move_bkg(g_foreground_position, 0); + LYC_REG = 0x00; + break; + } +} + +static inline void wait_frames(UINT8 frames) { + static UINT8 wait_counter = 0; + for (wait_counter = frames; wait_counter != 0; wait_counter--) { + wait_vbl_done(); + } +} + +inline void wait_for_button_press(UINT8 mask) { + while (!(joypad() & mask)) { + wait_vbl_done(); + } +} + +static inline void display_score() { + static UINT8 text_buffer[9]; + bcd2text(&g_player_score, NUMERALS_TILE_START, text_buffer); + static UINT8 count; + for (count = 0; count < 7; count++) { + if (text_buffer[count] == NUMERALS_TILE_START) { + text_buffer[count] = NUMERALS_TILE_START + 10; + } else { + break; + } + } + move_win(WINDOW_CENTERING_OFFSET + (((7 - count) * TILE_SIZE) / 2), 133); + set_win_tiles(0, 0, 8, 1, text_buffer); +} + +static inline void update_bird_animation_state() { + static UINT8 current_animation_frame = 0; + switch (current_animation_frame) { + case 0: + g_bird.tile_ids[0] = 0; + g_bird.tile_ids[1] = 1; + current_animation_frame = 1; + break; + case 1: + g_bird.tile_ids[0] = 4; + g_bird.tile_ids[1] = 5; + current_animation_frame = 2; + break; + case 2: + g_bird.tile_ids[0] = 6; + g_bird.tile_ids[1] = 7; + current_animation_frame = 0; + break; + } + metasprite_update_tiles(&g_bird); +} + +static inline void update_button_animation_state() { + static UINT8 current_animation_frame = 0; + switch (current_animation_frame) { + case 0: + g_button.tile_ids[0] = BUTTON_TILE_START + 4; + g_button.tile_ids[1] = BUTTON_TILE_START + 5; + g_button.tile_ids[2] = BUTTON_TILE_START + 6; + g_button.tile_ids[3] = BUTTON_TILE_START + 7; + current_animation_frame = 1; + break; + case 1: + g_button.tile_ids[0] = BUTTON_TILE_START; + g_button.tile_ids[1] = BUTTON_TILE_START + 1; + g_button.tile_ids[2] = BUTTON_TILE_START + 2; + g_button.tile_ids[3] = BUTTON_TILE_START + 3; + current_animation_frame = 0; + break; + } + metasprite_update_tiles(&g_button); +} + +inline void play_death_flash() { + BGP_REG = 0x90; + OBP0_REG = 0x90; + wait_frames(3); + BGP_REG = 0x40; + OBP0_REG = 0x40; + wait_frames(3); + BGP_REG = 0x00; + OBP0_REG = 0x00; + wait_frames(3); + BGP_REG = 0x40; + OBP0_REG = 0x40; + wait_frames(3); + BGP_REG = 0x90; + OBP0_REG = 0x90; + wait_frames(3); + BGP_REG = 0xE4; + OBP0_REG = 0xE4; +} + +inline void play_jump_sound() { + NR10_REG = 0x16; + NR11_REG = 0x40; + NR12_REG = 0x73; + NR13_REG = 0x00; + NR14_REG = 0xC3; +} + +void main(void) { + // Init sound + NR52_REG = 0x80; + NR50_REG = 0x77; + NR51_REG = 0xFF; + // Load Background + set_bkg_data(0, 10, BG_TILE_DATA); + set_bkg_data(NUMERALS_TILE_START, NUMERALS_TILE_START + 10, + NUMERALS_TILE_DATA); + set_bkg_data(GAME_OVER_TILE_START, GAME_OVER_TILE_START + 10, + GAME_OVER_TILE_DATA); + set_bkg_tiles(0, 0, BG_TILE_MAPWidth, BG_TILE_MAPHeight, BG_TILE_MAP); + // Load tiles into VRAM + set_sprite_data(0, 8, BIRD_TILE_DATA); + set_sprite_data(PIPE_TILE_START, PIPE_TILE_START + 4, PIPE_TILE_DATA); + set_sprite_data(BUTTON_TILE_START, BUTTON_TILE_START + 7, BUTTON_TILE_DATA); + + STAT_REG = 0x45; // Enable H-Blank Interrupt + LYC_REG = 0x00; + + disable_interrupts(); + add_LCD(on_hbl_interrupt); + enable_interrupts(); + + set_interrupts(VBL_IFLAG | LCD_IFLAG); + + metasprite_init(&g_bird); + + SHOW_BKG; + SHOW_SPRITES; + SHOW_WIN; + DISPLAY_ON; + + while (true) { + + metasprite_move_to(&g_bird, 30, 70); + set_win_tiles(0, 0, 20, 2, NUMERALS_TILE_MAP); + g_player_score = 0; + display_score(); + metasprite_init(&g_button); + + static UINT8 last_button_state; + static UINT8 button_state; + static UINT8 frame_count = 0; + while (true) { + button_state = joypad(); + if (button_state & J_A) { + play_jump_sound(); + metasprite_jump(&g_bird); + last_button_state = button_state; + break; + } + if (frame_count % CYCLE_ANIMATION_N_FRAMES == 0) { + update_bird_animation_state(); + } + if (frame_count % CYCLE_BUTTON_N_FRAMES == 0) { + update_button_animation_state(); + } + frame_count += 1; + g_background_position += BACKGROUND_SCROLL_SPEED; + g_foreground_position += g_foreground_scroll_speed; + wait_vbl_done(); + } + + initrand(DIV_REG); + + static Pipe pipe; + pipe.x = 200; + pipe.gap_skip = 8; + for (UINT8 i = 0; i < 36; i++) { + pipe.sprite_ids[i] = i + 4; + } + pipe_init(&pipe); + pipe_move_gap_height(&pipe, 2 + (((UINT8)rand()) % (15 - pipe.gap_skip))); + + while (true) { + pipe_scroll_horizontal(&pipe, -1 * g_foreground_scroll_speed); + if (pipe.x == 0xF0) { + static const BCD score_per_pipe = 1; + static BCD *const spp_ref = &score_per_pipe; + + bcd_add(&g_player_score, spp_ref); + display_score(); + switch (g_player_score) { + case 0x20: + pipe.gap_skip = 7; + break; + case 0x35: + pipe.gap_skip = 6; + break; + case 0x50: + g_foreground_scroll_speed = 3; + break; + } + pipe_move_gap_height(&pipe, + 2 + (((UINT8)rand()) % (15 - pipe.gap_skip))); + pipe_scroll_horizontal(&pipe, -78); + } + button_state = joypad(); + if ((button_state & J_A) && !(last_button_state & J_A)) { + play_jump_sound(); + metasprite_jump(&g_bird); + } + if (frame_count % APPLY_GRAVITY_N_FRAMES == 0) { + metasprite_apply_gravity(&g_bird); + } + if (frame_count % CYCLE_ANIMATION_N_FRAMES == 0) { + update_bird_animation_state(); + } + frame_count += 1; + g_background_position += BACKGROUND_SCROLL_SPEED; + g_foreground_position += g_foreground_scroll_speed; + metasprite_update_position_using_velocity(&g_bird); + if (g_bird.y < 0x05) { + g_bird.y = 0x05; + g_bird.velocity_y = 0x00; + } + if (g_bird.y + g_bird.height > 0x85) { + break; + } + if (g_bird.x > (pipe.x - g_bird.width) && + g_bird.x < pipe.x + PIPE_WIDTH) { + if (g_bird.y < ((pipe.height_of_gap + 1) * TILE_SIZE) || + g_bird.y + g_bird.height > ((pipe.height_of_gap * TILE_SIZE) + + (pipe.gap_skip * TILE_SIZE))) { + break; + } + } + last_button_state = button_state; + wait_vbl_done(); + } + play_death_flash(); + pipe_hide(&pipe); + metasprite_hide(&g_bird); + set_sprite_prop(g_button.sprite_ids[0], 0); + set_sprite_prop(g_button.sprite_ids[1], 0); + set_sprite_prop(g_button.sprite_ids[2], 0); + set_sprite_prop(g_button.sprite_ids[3], 0); + g_foreground_scroll_speed = FOREGROUND_SCROLL_SPEED; + if (g_player_score > g_player_high_score) { + g_player_high_score = g_player_score; + } + static UINT8 score_buffer[9]; + static UINT8 high_score_buffer[9]; + bcd2text(&g_player_score, NUMERALS_TILE_START, score_buffer); + bcd2text(&g_player_high_score, NUMERALS_TILE_START, high_score_buffer); + BGP_REG = 0xC0; + set_win_tiles(0, 0, 20, 2, NUMERALS_TILE_CLEAR); + set_win_tiles(6, 4, GAME_OVER_MAPWidth, GAME_OVER_MAPHeight, GAME_OVER_MAP); + set_win_tiles(6, 8, 8, 1, score_buffer); + set_win_tiles(6, 12, 8, 1, high_score_buffer); + move_win(0, 0); + wait_frames(180); + BGP_REG = 0xE4; + } +} |